Hypertext Webster Gateway: "straightedge"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Straightedge \Straight"edge`\, n.
A board, or piece of wood or metal, having one edge perfectly
straight, -- used to ascertain whether a line is straight or
a surface even, and for drawing straight lines.
From WordNet (r) 1.7 (wn)
straightedge
n : hand tool consisting of a flat rigid rectangular bar (metal
or wood) that can be used to draw straight lines (or test
their straightness)
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